graphical representation of amino acids

[Falson]

HI all,
does anyone know a software (shareware, freeware..) able to get an 
automatic graphical representation of proteins where each residue is 
placed in a circle, each circle linked to the following and organized 
in alpha, beta or coil structures. This type of representation can be 
found time to time in publications. I wonder if it is made each time 
manually by using a drawing software or a more specific one.
Thank